Background: This thesis is about knowledge transfer and diversity at Nordic trading floors. The research is focusing on knowledge transfer and how it is influenced by diversity and the ties between homogenous people. Purpose: The purpose of this study is to understand how the knowledge transfer could be more efficient at Nordic trading floors and whether employees prefer to share knowledge with employees to whom they either have a weak or strong social tie to. We also want to see how homogenous people impact the flow of knowledge transfer. Methodology: This research is conducted through a case study of respondents working at trading floors at two different banks in the Nordic countries. The data is mainly collected through quantitative surveys and qualitative interviews. Conclusions: Knowledge transfer at Nordic trading floors is implemented through different types of training and mentoring and by keeping up with strong social ties which is feeding the sociocultural arena. Homogenous people are contributing to knowledge transfer by spreading tacit knowledge while networking and socializing with each other. Wearing suits and playing golf might therefore help employees at Nordic trading floors to learn more.